One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(9,10,13,15)(11,14,12,16)(17,18)(19,23)(20,27)(21,24)(22,25)(26,30)(28,32)(29,31)(1,3)(2,5)(4,8)(6,7)(9,11,13,12)(10,14,15,16)(19,26)(20,28)(21,29)(23,30)(24,31)(27,32)(9,12,13,11)(10,14,15,16)(17,19,22,20)(18,23,25,27)(21,28,29,26)(24,32,31,30)(2,6)(5,7) involution — undirected(3,8)(5,7)(17,20,22,19)(18,23,25,27)(21,26,29,28)(24,32,31,30)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.